package com.testfileupload.uploadimg.design.interpreter;

public abstract class SymbolExpression extends Expression{
    protected Expression left;
    protected Expression right;
    //所有的解析公式应该只关心自己左右两个表达水的结果

    public SymbolExpression(Expression left, Expression right) {
        this.left = left;
        this.right = right;
    }
}
